Pump with split cylinder



Feb. 5, 1946.

w. TUCKER PUMP WITH SPLIT CYLINDER Filed Nov. 14, 1941 2 Sheets-Sheet 1av m I. luv In. I n WARREN kJucnz'n,

Annual":

Feb. 5, 1946. w, R, TUCKER 2,394,120

v PUMP WJTHSPLIT CYLINDER Filed Nov. 14, 1941 2 Sheets-Shet 2' AvruuvsPatented Feb. 5, 1946 PUMP wrrn SPLIT CYLINDER Warren It. Tucker,Dayton, Ohio, assignor to The Hydraulic Development Corp. Inc.,Wilmington, Del., a corporation oi Delaware Application November 14,1941, Serial No. 419,058

7 Claims. (Cl. 103136) This invention relates to a fluldpump andparticularly to a pump of the rotary type for circulating a liquid.

An object of the invention is to provide a rotary pump having a solidrotor and a split cylinder.

Another object of the invention is to provide a rotary pump wherein amore rugged construction is used for retaining the cylinder and rotor incooperative working relationship.

Another object of the invention is to provide a rotary pump having aminimum number of fastening means for holding the cylinder and rotor inassembled relationship. 3

Another object of the invention is to provide a rotary pump wherein theend walls of the rotor are integral with the body of the rotor, the

cylinder associated therewith being split parallel to the axis thereofto permit assembly upon the rotor.

It is another object of the invention to provide a rotary pump of thevane type wherein the body of the rotor and the end walls tor the sameare a unitary structure and the cylinder thereof is divided to permitassembly upon the rotor.

Another object of the invention is to provide a variable delivery pumpconstructed in accordance with the foregoing obiects.

Another object of the invention is to provide a reversible and variabledelivery pump con structed in accordance with the foregoing objects.

Another object of the invention is to provide a pump housing and pumpstimcture for location within the housing" which is more compact andmore ruggedit is another object of the invention to provide a rotarypump having e. cylinder divided along the axis thereof.

Another objectoi the invention is to provide a rotary pump having thecylinder divided along the axis thereof wherein means is provided foraligning the cylinder halves.

Another object oi the invention is to provide a rotary pump having acylinder divided along the axis thereof with means for aligning thecylinder halves both longitudinally of the axis and transversely of theaxis of the cylinder.

Further objects and advantages will become apparent from the drawingsand the following description.

In the drawings:

Figure 1 is a longitudinal cross-sectional view of a rotary or vane pumpbuilt in accordance with the teachings of this invention and is takenalong line i-l of Figure 2.

Figure 2 is a transverse cross-sectional view of the pump taken alongline 2-2 of Figure 1.

Figure 3 is an end elevational view of the cyl- I inder and rotor oi thepump of Figures 1 and 2 shown in their relative positions prior toassembly.

Figure 4 is a cross-sectional'view oi the means for securing togetherthe parts of. the cylinder,-

taken along line 4-4 of Figure 2.

Figure 5 is a perspective elevational view of the structure for aligninghalves with respect to one another longitudinally and transversely orthe axis of the cylinder. I

The pump of this invention is of the rotary type for moving a body ofliquid and for placing the same under pressure. The conventional rotarypump consists of a rotor driven by a suitable power shait and rotatedwithin a suitable cylinder bore. End plates are secured to the rotor orthe cylinder to provide a pumping chamber between the rotor and thecylinder. Liquid is drawn into the pump by rotation of the rotor and isdischarged under pressure from the opposits side of the pump.

When rotary pumps are used to develop high liquid pressures there isconsiderable tendency for the fastening means securing the end plates tothe rotor or cylinder to stretch and pet leakage of high pressureliquid. Therefore, it

becomes important to produce a rotor and cyl inder structure which willhave a. minimum mum her oi bolts securing the assembly.

In this invention the rotor of the pump and the end plates normallyassociated with the re tor are produced us u one-piece unit. The cylinder associated with the rotor is divided along the axis of thecylinder to provide two halves which can be bolted together when inposition adjacent the rotor to produce a pump assembly. The structure ofthis invention thereby uses only two bolts to assemble the rotor andcylinder in their operating relationship.

The rotary pump of this invention will be described with particularreference to a vane type rotary pump. However, it is to be understoodthat the structure disclosed in this invention is not limited to a vanetype rotary pump but can be used in connection with other forms of thetation of the pump or the position of. the cylinder with respect to therotor. The liquid flow passages l2 and I! are connected to the chamberII by means of the passages l4 and I5 respectively.

-The pump unit locatedwithin the chamber consists of a rotor 29 and acylinder 25.

The rotor 20 is a one-piece unit and consists of a cylindrical bodyportion l8 having annular flanged portions l1 and I8 which form andplates associated with the body portion I6. The end plate I1 is integralwith a shaft l9 which forms the drive shaft of the rotor 28. The shaftI8 is bearinged within the casing II by means of the ball bearing 2|which is suitably positioned within a recess 22 in the chamber The endplate l3 has a cylindrical extending portion 23 forming a shaft forsupporting the end plate Ill. The shaft 23 is supported by means of aball bearing 24 suitably carried within a recess 26 provided in a coveror end plate 21.

The end plate 21 is secured to the casing III by v means of the bolts28.

The rotor 20 has an axial bore 29 and an axial bore 38 of somewhat lessdiameter than the bore 29. The rotor 28 is also provided with aplurality of slots 3| which may extend radially from the axis 01' therotor 28. These slots are of the same length as the distance between theend plates l1 and I8 and extend completely through the body portion l6of the rotor 28.

Vanes 32 are carried in the slots 3| and are of substantially the samesize as the slots 3| to provide a sliding relationship therebetween. Theouter ends 33 of the vanes 32 engage the cylinder bore 35 of thecylinder 25, while the inner ends 34 of the vanes 32 engage afrusto-conical shaped member 48. The inner ends of the vanes 34 areprovided with an angular surface along the length of the vanes 32 tomatch the angular shaped surface of the frusto-conical shaped member 48.Sincethe inner ends 34 of the vanes 32 engage the member the outer ends33 of the vanes 32 will be maintained in engagement with the cylinderbore 35 at all times.

The frusto-conical shaped member 49 is located within the axial bore 29provided in the rotor 20 and is urged in a rightward direction, asviewed in Figure 1 by means of a piston plunger 36 slidably positionedwithin the axial bore 30. A compression spring 31 urges the pistonplunger 36 against the lefthand end of the member 40 so that the angularwalls of the member 49 will urge the vanes 32 outwardly as heretoforedisclosed.

The righthand end of the axial bore 29 in the rotor 20 is threaded toreceive a threaded plug 39, the inner end of which is in engagement withthe righthandend of the member 40, whereby do not'interfere with'any ofthe operating mechanism.

Since the rotor 20 is a one-piece element and the cylinder-'25 is atwo-part element the only fastening means required for assembling thecyiinder and the rotor in working relationship are the two bolts 41 and48. Therefore, the ruggedness of the rotor and the cylinder is greatlyincreased and the tendency toward separation of the working parts of therotor and cylinder is eliminated since the bolts 41 and 48 can be madesufficiently large to absorb any pressure which can be developed by thepump.

The cylinder 25 is slidably positioned within the chamber between theparallel walls 49- and 50, the cylinder 25 having cooperating parallelwalls for engagement therewith. Actuating members 5| and .52 extendthrough the wall of the chamber through the openings 53 and 54 intoengagement with opposite sides of the cylinder 25. The actuating members5| and 52 may be connected to suitable mechanisms for shifting theposition of the cylinder 25 with respect to the rotor 20 to vary theeccentricity between the rotor and the cylinder and thereby vary the capacity of the pump, or if the eccentricity is reversed from that shownin Figure 2 the delivery from the pump will be reversed. The controlsfor actuating the members 5| and 52 can be either manual or automaticcontrols and are well known in the art of variable delivery fluid pumpsand further discussion thereof is not deemed necessary.

Since the cylinder 25 is constructed in two half segments 4| and 42 itbecomes necessary to align the half segments both longitudinally andtransversely with respect to the axis of the cylinder bore 35. Such analignment is required to permit the vanes to pass over the dividing linebetween the cylinder segments 4| and 42 and also to locate cooperatingexterior faces 55, 56 and 51, 58 of the cylinder segments in the sameplane so that the end plates "and I8 will seal against the the member 40is positioned with respect to the 60 and 45 respectively in the oppositesegment. The

bolts 41 and 48 can be as large in diameter as desired, since theyextend through the cylinder body and can be positioned in a manner thatthey parallel exterior faces 55, 58 and 51, 58 of the cylinder segments4| and 42.

Each of the cylinder segments has its parting face provided with ashoulder and a key slot which cooperates with a shoulder and a key slotin the cooperating parting face of the opposite cylinder segment. InFigure 5 there is shown one of the parting faces of the cylindersegments 4| and 42 and particularly the parting face of the righthandside of the lower cylinder segment 42, as viewed in Figure 3.

The partingface of the lower cylinder segment 42, as shown in Figure 5,consists of a plane area 59 and a plane area 68 which are joined by avertical shoulder 6|. The bolt hole 44 extends through the parting faceat right angles thereto. The vertical shoulder 6| is positionedapproximately midway across the parting face of the segment 42 withrespect to the longitudinal axis of the cylinder 25 and radially fromthe axis. of the cylinder 25.

As shown in Figure 3, the high plane area of the righthand side of thelower segment 42 is positioned toward the rear thereof, while the lowplane area is positioned toward the front of the figure. The position ofthe plane areas 59a andBlla on the lefthand side of the lower sestructed'in the same manner as the parting face shown in Figure and thelocation of the plane areas of the parting faces 62 and 83 are arrangedto cooperate with the parting faces of the lower cylinder segment in amanner that the vertical shoulders between the plane areas are inengagement with each other to position the cylinder segment 4| withrespect to the cylinder segment 42 longitudinally of the axis ofthecylinder bore 35.v The Shoulders 6| between the plane areas of theparting faces thereby locate the exterior faces 8!, 58 and 51, 58 of thecylinder segments 4| and 42 in parallel planes.

To locate the transverse position of the segments with respect to oneanother and thereby establish a perfect cylinder bore a recess 84 isprovided in the plane area 59 and a recess 65 is provided in the planearea 60, as shown in Figure 5. The recesses 64 and 65 are located atright angles to the shoulder BI and are in parallel alignment with theaxis of the cylinder bore 35. The parting face of the upper cylindersegment 4i cooperating with the parting face of the lower cylindersegment is provided with corresponding recesses therein. as shown inFigure 4, these recesses being indicated by the numerals 66 and 61. Akey 68 is placed within the cooperating recesses 64 and 86 and a'corresponding key 69 is placed in the cooperating recesses 65 and 61.The keys 68 and 69 provide means to align the cylinder bore of the uppersegment 4|.with a cylinder bore of the lower segment 42 in a transverserelationship with respect to the axis of the cylinder bores.

With the cylinder segments 4i and 42 arranged in their proper alignedrelationship the bolts 41 and 48 can be tightened to retain thealignment and assemble the divided cylinder upon the one-piece rotor 20.

It may thus be seen that the applicant has provided a pump structurewherein there is required the use of only two bolts to maintain theassembly in proper working relationship and which bolts can be of thesize necessary to withstand the maximum force tending to separatethecylinder segments. While other bolts 28 hold the cover plate 21 to thecasing l0, yet these bolts do not absorb any strain developed by thepressure within the pump and are thus relativelyunimportant from. thestandpoint of assembly of the pumping unit itself.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:

1. In a rotary pump comprising a one-piece rotor including a cylindricalbody portion and parallel end plates, a multiple-part cylinder for saidbody portion, said cylinder being divided substantially parallel withthe axis thereof to permit assembly upon said rotor body portion body,said cylinder parts having cooperating engaging paired faces disp sedparallel to the axis of the cylinder, each of said faces comprisingplane areas offset laterally of the cylinder axis and joined by ashoulder disposed substantially normal to the axis of the cylinder, theengaging faces of each pair being complementary to align said cylinderparts in the direction of the axis of the cylinder and position thecooperating end face walls of the cylinder parts in planar relationshipfor engaging said end plates on said rotor when said complementaryshoulders are in contact, there being mating key slots in eachcooperating face, substantially normal to said shoulders to jointly forma key-retaining slot for receiving a key to align said cylinder parts ina direction normal to, the axis of said cylinder.

3. A rotary pump comprising a one-piece rotor including a'cylindricalbody portion and parallel end plates, a multiple-part cylinder dividedparallel with the axis thereof to permit assembly upon said rotor bodyand between said end plates and in rotary and sealing engagement withthe end plates, said cylinder parts having cooperating engaging pairedfaces disposed parallel to the axis of the cylinder, one of each of saidpaired faces comprising plane areas oflset laterally of the cylinderaxis and connected by a shoulder disposed angularly to the axis of thecylinder and ex-' tending completely across said face for cooperativeengagement with a cooperating shoulder on between said end plates, saidcylinder parts having cooperating engaging paired faces disposedsubstantially parallel to the axis of the cylinder, each of aid engagingpair of faces comprising two plane areas offset laterally to the axis ofthe cylinder and connected by a shoulder, disposed ang'ularly to theaxis of the cylinderthe engaging faces of each pair being complementaryto align said cylinder parts longitudinally along the axis of thecylinder when said shoulders are in contact.

2. In a rotary pump, a rotor including a cylindrical body portion andparallel end plates, a multi-part cylinder divided parallel with theaxis thereof to permit assembly upon said rotor the cooperating engagingface, the meeting faces of each pair being complementary to therebyalign said cylinder parts in a direction longitudinally of the cylinderaxis and position the onoperating end face walls of the cylinder partsin planar relationship for rotary engaging relationship with said endplates on said rotor, these being mating'key slots in each of saidcooperating faces, each slot being disposed angularly to said shouldersand extending across said shoulders, and a key fitting the slotconjointly formed by each mating pair of slots to align said cylinderparts in a direction normal to the axis thereof.

4. A rotary pumpcomprising a, rotor including a cylindrical body andparallel and plates, a multipart cylinder divided parallel with the axisthereof to permit assembly upon said rotor body between and in slidingand sealing engagement with the end plates, said cylinder parts havingmeeting pairs of faces-disposed parallel and substantially coplanar withthe axis of the cylinder, one a cylinder part in planar relationship forrotation in contact with said end plates, there being mating key slotsin each of said cooperating faces,

respectively, each slot being disposed angularly across said shoulders,at key fitting the slot cons jointly formed by each pair of mating slotsand aligning said cylinder parts normal to the axis thereof to positionthe same to form a true cylindrical cavity for said rotor body, and boltmeans extending through apertures intercepting the correspondingshoulders and key slots to secure said cylinder parts together.

5. A variable delivery fluid pump including, 'a casing having parallelwalls forming guiding 'surfaces for a cylinder movable therein, aone-piece rotor including a cylindrical body portion and parallel endplates extending radially therefrom and supporting shai't portionsbearinged in said casing, a multiple-part cylinder divided along theaxis thereoi positioned in cooperating relationship with said rotor andin engaging relationship asaaiao cylinder normal to the axis of saidrotor ror changing the eccentric relation ,therebetween and therebychanging the discharge capacity oi said with said end plates to providea compression chamber, bolt means for holding said cylinder parts inassembled relationship, and parallel suriaceson said cylinder disposedparallel to the axis theme! and parallel with the dividing plane betweenthe cylinder parts for engaging said parallel surfaces in saidcaslng insliding relationship therewith whereby to permit movement of saidcylinder normal to the axis 01' said rotor for changing the eccentricrelation therebetween and thereby changing the discharge capacity oisaid pump. v

6. A variable delivery fluid pump includins, a casing having parallelwalls iorming guiding suriaces for a cylinder movable therein, arotorincluding a cylindrical body portion, parallel end plate extendingnormal to the axis thereof and supporting shaft portions Journaled insaid casing, a multiple-part cylinder divided along the axis thereofpositioned in cooperating relationship with said rotor and in engagingrelationship with said end plates to provide a compression chamber. boltmeans ior holding said cylinder parts in assembled relationship,parallel urfaces on said cylinder disposed parallel to the axis thereofand parallel with the dividing plane between the cylinder parts forengaging said parallel surfaces in said casing in sliding relationshiptherewith whereby to permit movement oi said pump, said cylinder partshaving cooperating engaging paired iaces disposed parallel to the axisoi the cylinder. each face oi said paired iaces comprising parallelflats oiiset laterally oi said cylinder axis and Joined by a shoulderdisposed substantially normal to the axis of the cylinder, the iace oieach pair being complementary to thereby align said cylinder parts alongthe axis oi the cylinder and position the cooperating end face walls oithe cylinder parts in coplanar relationship, them being matching keyslots in each 1 oi said paired iaces, each slotbeing disposedsubstantially normal to the correspondingshoulder, and a key fitting theslot formed conjointly by each matching pair oi slots to thereby alignsaid cylinder parts laterally oi the axis thereof so that said partsconiointly iorm a true cylinder.

7. In a rotary pump, a rotor including a cylindrical body havingparallel and plates normal WARREN R. TUCKER.

